Dear Rohid Thanks for your information. i have completed done as you said. but still i have voice problem when ever i make call from action voip i can hear their voice, but they cant hear my voice. and i couldnt find where i want enter codecs in nokia n900 . iam really frustated. earler i used N97 there is lot of supporting software like mobile voip & Nimbuzz i can made call from n97 crysytal clear voip call but n 900 not support anything. i think i wasting my money . please let me know what is solution for that?? how can i setup audio codec in n900? or is there any other supporting software?